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Heejun Park(박희준),Abdul Rehman(압둘 레만),Changhyeong Lee(이창형),Sung Hun Jin(진성훈),Sungtek Kahng(강승택) 대한전기학회 2019 전기학회논문지 Vol.68 No.2
In this paper, we show a new scheme to tackle the problems of high electromagnetic-coupling, poor impedance-matching. and degraded radiation-characteristics of two RFID tag antennas, when they are located with an extremely short distance. As giving it a variety of tries such as periodic EBG-type structures and notch-making stubs, we can get an optimal device to lower the electromagnetic coupling and to match the input impedance of both of the tag antennas. Even for a UHF-band, the device is very thin less than 1 mm unlike other isolation-enhancers which are thick or multi-layered. The dips in the S11 and S21-curves are generated at the target frequency, which means excellent impedance match and lowered interference for the two tag dipole-antennas. This is helpful to higher thruput in RFID.
하선호(Sun-Ho Ha),이동우(Dong-Woo Lee),아따 울 레만(Atta Ur Rehman),압둘 와지(Abdul Wasy),송정일(Jung-Il Song) 한국기계가공학회 2013 한국기계가공학회지 Vol.12 No.4
Zirconia is well known in industrial applications for its mechanical characteristics. DLC (diamond-like carbon) have high elastic modulus, high electric resistivity, high dielectric constant, high wear resistance, low friction coefficient, bio compatibility, chemically inert and thermally stable. Because of all these physical and chemical properties these types of coatings have become key procedure for thin coating. Friction coefficient of DLC films is already evaluated and the current work is a further advancement by calculating the fracture toughness and wear resistance of these coatings. In the present study DLC thin film coatings are developed on ZrO₂ alloy surface using Plasma Enhanced Chemical Vapor Deposition (PECVD) method. Vicker hardness test is employed and it was concluded that, DLC coatings increase the Vickers hardness of ceramics.